Motor

ABSTRACT

Provided is a motor in which the positional misalignment of a terminal cover provided to a motor body can be suppressed. In a terminal cover ( 7 ) fixed to a motor body ( 40 ), an engagement plate part ( 75 ) extends from a cover part ( 71 ), which covers a terminal part ( 25 ) on a lateral surface of the motor body ( 40 ), to a position overlapping an end surface ( 12 ) on a counter-output side (L 2 ) of the motor body ( 40 ). The engagement plate part ( 75 ) is provided with an engagement recess ( 750 ) in which a projection ( 17 ) on the end surface ( 12 ) on the counter-output side (L 2 ) of the motor body ( 40 ) is fitted. Thus, even when external force is applied to the terminal cover ( 7 ), the terminal cover ( 7 ) is less likely to be subjected to positional misalignment. The engagement recess ( 750 ) is groove shaped, and the projection ( 17 ) is fitted to an end part, in the extending direction, of the engagement recess ( 750 ) formed in a groove shape.

FIELD OF THE INVENTION

The present invention relates to a motor in which a terminal cover isattached to a motor main body.

BACKGROUND ART

In a motor, in order to protect terminals, an electric connected portionwith the terminals and a wiring board in a terminal part or the like, aterminal cover is sometimes provided in a side face of a motor main bodyand the terminal part of the motor main body is covered by the terminalcover. The terminal cover is fixed through engagement with the side faceof the motor main body (see Patent Literature 1).

CITATION LIST Patent Literature

[PTL 1] Japanese Patent Laid-Open No. 2014-209835

SUMMARY OF THE INVENTION Technical Problem

However, in a case that a terminal cover is fixed by engaging theterminal cover with a side face of the motor main body like the motordescribed in Patent Literature 1, when a connector and the like are heldby the terminal cover, a force applied when the connector is to beattached is transmitted to the terminal cover and positionaldisplacement may be occurred in the terminal cover. The positionaldisplacement may cause a trouble in an electric connection inside theterminal cover and thus it is unfavorable.

In view of the problem described above, an objective of the presentinvention is to provide a motor capable of suppressing positionaldisplacement of the terminal cover provided in the motor main body.

Solution to Problem

To achieve the above mentioned objective, the present invention providesa motor including a motor main body having a rotation shaft which isprotruded toward an output side and a terminal cover which is fixed tothe motor main body. The motor main body includes a terminal part whichholds terminals in a side face of the motor main body, and a protrudedpart which is protruded from an end face on an opposite-to-output sideof the motor main body toward the opposite-to-output side. The terminalcover includes a cover part which covers the terminal part on the sideface of the motor main body, and an engaging plate part which isextended from the cover part so as to overlap with the end face, and theengaging plate part is provided with an engaging recessed part to whichthe protruded part is fitted.

In the present invention, in the terminal cover fixed to the motor mainbody, the engaging plate part is extended from the cover part, whichcovers the terminal part on the side face of the motor main body, to aposition overlapped with the end face on the opposite-to-output side ofthe motor main body, and the engaging plate part is provided with theengaging recessed part to which the protruded part of the end face onthe opposite-to-output side of the motor main body is fitted. Therefore,even when an external force is applied to the terminal cover, positionaldisplacement of the terminal cover is hard to be occurred.

In the present invention, it may be structured that the protruded partis located on a rotation center axial line of the rotation shaft.

In the present invention, it may be structured that the protruded partis formed by a bearing which supports the rotation shaft on theopposite-to-output side. According to this structure, a dedicated designfor providing the protruded part in an end face on theopposite-to-output side of the motor main body is not required. Further,the bearing serves as a reference of the motor and thus its positionalaccuracy is high. Therefore, engagement of the engaging plate part canbe performed surely.

In the present invention, it is preferable that a depth on a center sideof the engaging recessed part is deeper than a depth of an adjacentportion to the center side, and the protruded part is contacted with theadjacent portion. According to this structure, even when the end part ofthe rotation shaft is exposed at a center of the bearing, contacting ofthe rotation shaft with the engaging plate part can be avoided.

In the present invention, it is preferable that the engaging recessedpart is a recessed part in a groove shape which is extended in a radialdirection, and the protruded part is fitted into a tip end part in anextending direction of the engaging recessed part. According to thisstructure, positional displacement of the terminal cover in a directionseparated from the motor main body is suppressed by engagement of theprotruded part with the engaging recessed part.

In the present invention, it is preferable that the terminal partincludes a terminal block which is protruded to an outer side in aradial direction, and the cover part is provided with an engaging partwhich is engaged with the terminal block. According to this structure,the cover part can be fixed to the terminal block by utilizing theterminal block.

In the present invention, it may be structured that the terminal blockis provided with a recessed part which is opened toward one side in therotation center axial line direction of the rotation shaft on an innerside in the radial direction, the recessed part being provided in a partof the terminal block in a circumferential direction of the motor mainbody, and the engaging part is provided with an arm part which isoverlapped with an end part on one side in the rotation center axialline direction of the terminal block, and a pawl part which is benttoward the other side in the rotation center axial line direction at atip end part of the arm part to enter to the recessed part. According tothis structure, positional displacement of the terminal cover in adirection separated from the motor main body can be suppressed.

In the present invention, it may be structured that the engaging part isprovided with a first engaging protruded part which is abutted with anend part of the terminal block facing the rotation center axial linedirection of the rotation shaft, and a second engaging protruded partwhich is abutted with an end part of the terminal block facing thecircumferential direction. According to this structure, positionaldisplacement of the terminal cover in a direction intersecting thedirection separated from the motor main body can be suppressed.

In the present invention, it is preferable that the cover part isprovided with an abutting part which is abutted with the side face ofthe motor main body.

The present invention is effectively applied to a case that the terminalcover holds a wiring board which supports a connector electricallyconnected with the terminals. In a case that a connector is used, alarge force is easily applied to the terminal cover through theconnector when insertion and separation are to be performed. However,according to the present invention, even when a large force is appliedto the terminal cover, positional displacement of the terminal cover canbe prevented.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1(a) and 1(b) are explanatory views showing a motor to which thepresent invention is applied.

FIG. 2 is the “XZ” cross-sectional view showing the motor to which thepresent invention is applied.

FIGS. 3(a), 3(b) and 3(c) are exploded perspective views showing a powerfeeding part of the motor to which the present invention is applied andwhich is viewed from an output side.

FIGS. 4(a), 4(b), 4(c) and 4(d) are enlarged perspective views showing aterminal part of the motor to which the present invention is applied.

FIGS. 5(a) and 5(b) are explanatory views schematically showing anengagement structure of a motor main body with a first member of aterminal cover in the motor to which the present invention is applied.

FIGS. 6(a) and 6(b) are perspective views showing the terminal cover ofthe motor to which the present invention is applied and which is viewedfrom the other side in a first direction.

FIGS. 7(a) and 7(b) are perspective views showing the terminal cover ofthe motor to which the present invention is applied and which is viewedfrom one side in the first direction.

DESCRIPTION OF EMBODIMENTS

An embodiment of a motor to which the present invention is applied willbe described with reference to the accompanying drawings. In thefollowing descriptions, in a direction where a rotation center axialline “L” of a rotation shaft 50 of a motor 10 is extended, a side wherethe rotation shaft 50 is protruded from a stator 4 is an output side“L1” and an opposite side to the side where the rotation shaft 50 isprotruded from the stator 4 is an opposite-to-output side “L2”. Further,in order to explain a terminal part 25 and a terminal cover 7, adirection where the terminal part 25 and the terminal cover 7 areoverlapped with each other is referred to as a first direction “X” and,in the following descriptions, “X1” is added for indicating one side inthe first direction “X” (side where the terminal cover 7 is located) and“X2” is added for indicating the other side in the first direction “X”(side where the terminal part 25 is located). Further, in the terminalpart 25 and the terminal cover 7, a direction along a circumferentialdirection of the motor 10 is referred to as a second direction “Y” and,in the following descriptions, “Y1” is added on one side in the seconddirection “Y” and “Y2” is added on the other side. Further, a directionintersecting the first direction “X” and the second direction “Y” isreferred to as a third direction “Z” and, in the following descriptions,“Z1” is added to one side in the third direction “Z” and “Z2” is addedon the other side. In the following descriptions, the third direction“Z” is a direction where the rotation center axial line “L” is extended,and one side “Z1” in the third direction “Z” corresponds to anopposite-to-output side “L2” and the other side “Z2” in the thirddirection “Z” corresponds to an output side “L1”.

(Structure of Motor 10)

FIGS. 1(a) and 1(b) are explanatory views showing the motor 10 to whichthe present invention is applied. FIG. 1(a) is a perspective viewshowing the motor 10 viewed from the output side “L1” and FIG. 1(b) is aperspective view showing the motor 10 viewed from the opposite-to-outputside “L2”. FIG. 2 is the “XZ” cross-sectional view showing the motor 10to which the present invention is applied. In FIGS. 1(a) and 1(b), anend plate 3 on the output side “L1” is indicated by the alternate longand short dash line so that a structure on the output side “L1” of amotor main body 40 is easily understood. Further, also in FIG. 2,similarly, the end plate 3 on the output side “L1” is indicated by thealternate long and short dash line.

As shown in FIGS. 1(a) and 1(b), the motor 10 includes the motor mainbody 40 (stator 4) and the end plate 3 which is fixed to an end face 11on the output side “L1” of the motor main body 40 by a method such aswelding. In the motor 10, a power feeding part 2 is provided on a sideface of the motor main body 40 (stator 4) on one side “X1” in the firstdirection “X”. In the power feeding part 2, as described below, a wiringboard 27 on which a connector 28 is mounted is held by the terminalcover 7 fixed to the side face of the stator 4.

As shown in FIG. 2, the motor 10 is a stepping motor which includes thestator 4 in a cylindrical tube shape. The stator 4 is structured so thatan “A”-phase stator and a “B”-phase stator are disposed so as to besuperposed on each other in the rotation center axial line “L”direction. Therefore, in the stator 4, two coil bobbins (first coilbobbin 42A and second coil bobbin 42B) around which a coil wire 46 iswound are disposed in a superposed state in the rotation center axialline “L” direction, and stator cores described below are disposed in asuperposed state in each of the coil bobbins. A ring-shaped inner statorcore 43A and an outer stator core 44A whose cross section is a “U”-shapeare disposed on both sides of the first coil bobbin 42A in the rotationcenter axial line “L” direction in a superposed state, and a ring-shapedinner stator core 43B and an outer stator core 44B whose cross sectionis a “U”-shape are disposed on both sides of the second coil bobbin 42Bin the rotation center axial line “L” direction in a superposed state. Aplurality of pole teeth 45 of the inner stator cores 43A and 43B and theouter stator cores 44A and 44B are structured to be adjacently arrangedin the circumferential direction on inner peripheral faces of the firstcoil bobbin 42A and the second coil bobbin 42B. In this way, the stator4 in a cylindrical tube shape is structured and a rotor 5 is coaxiallydisposed on an inner side in a radial direction of the stator 4. In thisembodiment, the outer stator cores 44A and 44B are respectively extendedto an outer side in the radial direction of the first coil bobbin 42Aand the second coil bobbin 42B to structure a motor case.

Therefore, a main body portion (motor main body 40) of the motor 10 inthis embodiment is schematically structured of the stator 4, and an endface 11 on the output side “L1” of the motor main body 40 is structuredof a ring-shaped portion 47 of the outer stator core 44A. On theopposite-to-output side “L2” of the stator 4, an end plate 65 is fixedto a ring-shaped portion 48 of the outer stator core 44B, and an endface 12 on the opposite-to-output side “L2” of the motor 10 isstructured of the end plate 65. Further, a side face of the motor mainbody 40 is structured of cylindrical tube portions 49 formed on outersides of the outer stator cores 44A and 44B.

In the rotor 5, a rotation shaft 50 is extended along the rotationcenter axial line “L”, and the rotation shaft 50 is protruded from anend face 11 on the output side “L1” of the motor 10. A permanent magnet59 in a cylindrical tube shape is fixed at a position on theopposite-to-output side “L2” of the rotation shaft 50 with an adhesiveor the like. An outer peripheral face of the permanent magnet 59 facesthe pole teeth 45 of the stator 4 on an inner side in the radialdirection of the stator 4 through a predetermined gap space.

On the output side “L1” of the motor 10, the rotation shaft 50 issupported by a bearing 62 which is held by the end plate 3 shown in FIG.1(a). A washer 66 through which the rotation shaft 50 is penetrated isdisposed between the bearing 62 and the permanent magnet 59.

On the opposite-to-output side “L2” of the motor 10, the end plate 65 isformed with a hole 650 through which an end part on theopposite-to-output side “L2” of the rotation shaft 50 is protruded tothe opposite-to-output side “L2”. A bearing 61 which supports therotation shaft 50 on the opposite-to-output side “L2” is disposed in thehole 650, and a protruded part 17 in a circular plate shape which isprotruded to the opposite-to-output side “L2” from an end face 12 on theopposite-to-output side “L2” is formed in the motor main body 40 by thebearing 61. The protruded part 17 is structured of the bearing 61 andthus the protruded part 17 is located on the rotation center axial line“L” of the rotation shaft 50.

A washer 67 through which the rotation shaft 50 is penetrated isdisposed between the bearing 61 and the permanent magnet 59. A coiledspring 63 which urges the rotor 5 to the output side “L1” is disposedaround the rotation shaft 50 between a bottom part of a recessed part595 of the permanent magnet 59 and the washer 67. A washer 69 throughwhich the rotation shaft 50 is penetrated is disposed between the bottompart of the recessed part 595 of the permanent magnet 59 and the coiledspring 63.

(Structure of Terminal Part 25)

FIGS. 3(a), 3(b) and 3(c) are exploded perspective views showing thepower feeding part 2 of the motor 10 to which the present invention isapplied and which is viewed from the output side “L1”. FIG. 3(a) is aperspective view showing a state that a second member 9 of the terminalcover 7 provided in the power feeding part 2 is detached, FIG. 3(b) is aperspective view showing a state that the wiring board 27 provided inthe power feeding part 2 is further detached, and FIG. 3(c) is aperspective view showing a state that a first member 8 of the terminalcover 7 provided in the power feeding part 2 is further detached. FIGS.4(a), 4(b), 4(c) and 4(d) are enlarged perspective views showing theterminal part 25 of the motor 10 to which the present invention isapplied. FIG. 4(a) is a perspective view showing the terminal part 25which is viewed from one side “Y1” in the second direction “Y” and theother side “Z2” in the third direction “Z”, FIG. 4(b) is a perspectiveview showing the terminal part 25 viewed from one side “Y1” in thesecond direction “Y” and one side “Z1” in the third direction “Z”, FIG.4(c) is a perspective view showing the terminal part 25 viewed from theother side “Y2” in the second direction “Y” and the other side “Z2” inthe third direction “Z”, and FIG. 4(d) is a perspective view showing theterminal part 25 viewed from the other side “Y2” in the second direction“Y” and one side “Z1” in the third direction “Z”. FIGS. 5(a) and 5(b)are explanatory views schematically showing an engagement structure ofthe motor main body 40 with the first member 8 of the terminal cover 7in the motor 10 to which the present invention is applied. FIG. 5(a) isan explanatory view showing a terminal block 22 which is viewed from theother side “Y2” in the second direction “Y”, and FIG. 5(b) is anexplanatory view showing the terminal block 22 which is viewed from oneside “Y1” in the second direction “Y”. In this embodiment, the terminalcover 7 is actually one connected product structured of the first member8 and the second member 9 which are connected with each other through ahinge part 70. However, in FIGS. 3(a), 3(b) and 3(c), the first member 8and the second member 9 are shown in a divided state at the hinge part70 for easily understanding the shapes of the respective portions.

As shown in FIGS. 3(a), 3(b) and 3(c), the power feeding part 2 includesthe terminal part 25 of the motor main body 40 and the terminal cover 7which covers the terminal part 25. The wiring board 27 which holds theconnector 28 is held by the terminal cover 7. In this embodiment, theterminal cover 7 includes the first member 8 fixed to the stator 4 onone side “X1” in the first direction “X” and the second member 9 whichcovers the first member 8 from one side “X1” in the first direction “X”.

The terminal part 25 includes the terminal block 22 protruded to oneside “X1” in the first direction “X” from cut-out parts 490 formed inthe cylindrical tube portions 49 of the outer stator cores 44A and 44B,and a plurality of terminals 24 in a pin shape which are protruded toone side “X1” in the first direction “X” from the terminal block 22. Theterminal block 22 is structured so that a thick portion 421A of thefirst coil bobbin 42A provided on one side “X1” in the first direction“X” and a thick portion 421B of the second coil bobbin 42B provided onone side “X1” in the first direction “X” are superposed on each other inthe third direction “Z” (rotation center axial line “L” direction). Theterminals 24 are protruded toward one side “X1” in the first direction“X” from each of the thick portions 421A and 421B.

The terminal block 22 is provided on an inner side in the radialdirection with a recessed part which is opened toward one side in therotation center axial line “L” direction in a part in thecircumferential direction of the motor main body 40. More specifically,the terminal block 22 is, as shown in FIGS. 4(a) and 4(b) and FIG. 5(b),provided on an inner side in the radial direction with a recessed part222 which is opened toward the opposite-to-output side “L2” in therotation center axial line “L” direction in a part in thecircumferential direction of the motor main body 40 (end part on oneside “Y1” in the second direction “Y”). Further, the terminal block 22is, as shown in FIGS. 4(c) and 4(d) and FIG. 5(a), provided on an innerside in the radial direction with a recessed part 221 which is openedtoward the output side “L1” in the rotation center axial line “L”direction in a part in the circumferential direction of the motor mainbody 40 (end part on the other side “Y2” in the second direction “Y”).The recessed parts 221 and 222 are engaged with pawl parts 862 and 872of the first member 8 which are described below with reference to FIGS.6(a) and 6(b).

Further, the terminal block 22 is, as shown in FIGS. 4(a), 4(b), 4(c)and 4(d), and FIGS. 5(a) and 5(b), provided with end parts 223 and 225facing the other side in the rotation center axial line “L” direction,and end parts 224 and 226 facing one side in the circumferentialdirection. The end parts 223, 225, 224 and 226 are abutted with thefirst engaging protruded parts 841 and 851 of the first member 8 and thesecond engaging protruded parts 842 and 852 of the first member 8 whichare described below with reference to FIGS. 6(a) and 6(b). Morespecifically, the terminal block 22 is provided with the end part 223which faces the opposite-to-output side “L2” in the rotation centeraxial line “L” direction (one side “Z1” in the third direction “Z”) andthe end part 224 which faces the other side “Y2” in the second direction“Y”. The end parts 223 and 224 are respectively abutted with the firstengaging protruded part 841 and the second engaging protruded part 842of the first member 8 which are described below with reference to FIGS.6(a) and 6(b). Further, the terminal block 22 is provided with the endpart 225 on the output side “L1” in the rotation center axial line “L”direction and the end part 226 which faces one side “Y1” in the seconddirection “Y”. The end parts 225 and 226 are respectively abutted withthe first engaging protruded part 851 and the second engaging protrudedpart 852 of the first member 8 which are described below with referenceto FIGS. 6(a) and 6(b).

(Structure of Terminal Cover 7)

FIGS. 6(a) and 6(b) are perspective views showing the terminal cover 7of the motor 10 to which the present invention is applied and which isviewed from the other side “X2” in the first direction “X”. FIG. 6(a) isa perspective view showing a state that the terminal cover 7 isdeveloped, and FIG. 6(b) is a perspective view showing a state that thesecond member 9 is overlapped with the first member 8 of the terminalcover 7. FIGS. 7(a) and 7(b) are perspective views showing the terminalcover 7 of the motor 10 to which the present invention is applied andwhich is viewed from one side “X1” in the first direction “X”. FIG. 7(a)is a perspective view showing a state that the terminal cover 7 isdeveloped, and FIG. 7(b) is a perspective view showing a state that thesecond member 9 is overlapped with the first member 8 of the terminalcover 7.

As shown in FIGS. 3(a), 3(b) and 3(c), FIGS. 6(a) and 6(b), and FIGS.7(a) and 7(b), the terminal cover 7 is provided with the first member 8fixed to the motor main body 40 on one side “X1” in the first direction“X” and the second member 9 which covers the first member 8 from oneside “X1” in the first direction “X”. The first member 8 and the secondmember 9 are connected with each other through the hinge part 70. Thehinge part 70 connects the second member 9 with the first member 8 sothat the second member 9 is capable of turning around an axial line “Y0”extended in the second direction “Y”. Therefore, when the second member9 is turned to one side “R1” around the axial line “Y0” at the hingepart 70 with respect to the first member 8, the second member 9 coversthe first member 8 from one side “X1” in the first direction “X”. Inthis embodiment, the terminal cover 7 is a resin molded product, and thefirst member 8, the second member 9 and the hinge part 70 are integrallymolded each other.

(Structure of First Member 8)

The first member 8 is provided with a plate part 80, which faces theterminal block 22 on one side “X1” in the first direction “X”, a firstside plate part 82 which is protruded from an end part on the other side“Z2” in the third direction “Z” of the plate part 80 toward the otherside “X2” in the first direction “X”, and a pair of second side plateparts 83 which are protruded from both end parts in the second direction“Y” of the plate part 80 toward the other side “X2” in the firstdirection “X”. The plate part 80 is formed with a through hole 805 in asubstantially rectangular shape structured to pass the terminals 24 fromthe other side “X2” in the first direction “X” to one side “X1”.

Each of outer faces of a pair of the second side plate parts 83 isformed with a first engaging protruded part 88 protruded toward an outerside in the “Y” direction at an end part on the other side “Z2” in thethird direction “Z”. Further, each of the outer faces of the pair of thesecond side plate parts 83 is formed with a second engaging protrudedpart 89 protruded toward an outer side in the “Y” direction at an endpart on one side “Z1” in the third direction “Z”. The first engagingprotruded part 88 and the second engaging protruded part 89 are engagedwith a first engaging part 91 and a second engaging part 92 of thesecond member 9 described below to maintain an overlapped state of thesecond member 9 with the first member 8 at a predetermined position. Thefirst engaging protruded part 88 and the second engaging protruded part89 are separated from each other in the third direction “Z”, and thefirst engaging protruded part 88 is located at a position closer to thehinge part 70 than the second engaging protruded part 89.

(Structure of Abutting Part of First Member 8)

In order to fix the first member 8 to the side face of the motor mainbody 40, first, a tip end face of the first side plate part 82 is formedto be an abutting part 820 which is curved so as to follow a side faceshape of the motor main body 40 and, when the first member 8 is attachedto the side face of the motor main body 40, the abutting part 820 isabutted with the side face of the motor main body 40 over apredetermined angular range in the circumferential direction. Further,tip end faces of the second side plate parts 83 are formed to beabutting parts 830 which are flat so as to follow the side face shape ofthe motor main body 40. The abutting part 830 is abutted with the sideface of the motor main body 40 over a predetermined range in therotation center axial line “L” direction (third direction “Z”). Further,a frame-shaped protruded part 835 which is protruded to the other side“X2” in the first direction “X” from the plate part 80 is formed on oneside “Z1” in the third direction “Z” with respect to the through hole805. Two side portions of the protruded part 835 which are extended inthe second direction “Y” are formed to be abutting parts 836 which arecurved so as to follow the side face shape of the motor main body 40and, when the first member 8 is overlapped with the side face of themotor main body 40, the abutting parts 836 are abutted with the sideface of the motor main body 40 over a predetermined angular range in thecircumferential direction. Further, two side portions of the protrudedpart 835 which are extended in the third direction “Z” are formed to beabutting parts 837 which are flat so as to follow the side face shape ofthe motor main body 40 and, when the first member 8 is fitted to theside face of the motor main body 40, the abutting parts 837 are abuttedwith the side face of the motor main body 40 over a predetermined rangein the rotation center axial line “L” direction (third direction “Z”).As a result, the first member 8 is positioned in the first direction “X”by the side face of the motor main body 40.

(Structure of Engaging Part of First Member 8)

The first member 8 is formed with an engaging part which is engaged withthe motor main body 40 to fix the first member 8 to the motor main body40. First, an engaging part 86 which is protruded from the plate part 80toward the other side “X2” in the first direction “X” is formed at aposition adjacent to the through hole 805 in the plate part 80 on theother side “Y2” in the second direction “Y”. The engaging part 86 isprovided with an arm part 861 protruded toward the other side “X2” inthe first direction “X” and a pawl part 862 which is bent from a tip endpart of the arm part 861 to one side “Z1” in the third direction “Z”.Further, an engaging part 87 which is protruded from the plate part 80toward the other side “X2” in the first direction “X” is formed at aposition adjacent to the through hole 805 in the plate part 80 on oneside “Y1” in the second direction “Y”. The engaging part 87 is providedwith an arm part 871 protruded toward the other side “X2” in the firstdirection “X” and a pawl part 872 which is bent from a tip end part ofthe arm part 871 to the other side “Z2” in the third direction “Z”.

Therefore, when the first member 8 is fitted to the side face of themotor main body 40, as schematically shown in FIG. 5(a), the arm part861 of the engaging part 86 is contacted with the end part 225 of theterminal block 22 on one side in the rotation center axial line “L”direction (other side “Z2” in the third direction “Z”) and the pawl part862 of the tip end part of the arm part 861 is entered and engaged withthe recessed part 221 of the terminal block 22 from one side in therotation center axial line “L” direction (other side “Z2” in the thirddirection “Z”). Further, when the first member 8 is fitted to the sideface of the motor main body 40, as schematically shown in FIG. 5(b), thearm part 871 of the engaging part 87 is contacted with the end part 223of the terminal block 22 on one side in the rotation center axial line“L” direction (on side “Z1” in the third direction “Z”) and the pawlpart 872 of the tip end part of the arm part 871 is entered and engagedwith the recessed part 222 of the terminal block 22 from one side in therotation center axial line “L” direction (one side “Z1” in the thirddirection “Z”). Therefore, the first member 8 is fixed to the motor mainbody 40 from both sides in the first direction “X” and from both sidesin the third direction “Z”.

In FIGS. 6(a) and 6(b), a first engaging protruded part 841 protrudedfrom the plate part 80 toward the other side “X2” in the first direction“X” is extended in the second direction “Y” in the plate part 80 alongthe through hole 805 at a position adjacent to the through hole 805 onthe other side “Y2” in the second direction “Y” and one side “Z1” in thethird direction “Z”. Further, a second engaging protruded part 842protruded from the plate part 80 toward the other side “X2” in the firstdirection “X” is extended in the third direction “Z” in the plate part80 along the through hole 805 at a position adjacent to the through hole805 on one side “Z1” in the third direction “Z” and the other side “Y2”in the second direction “Y”.

Similarly, a first engaging protruded part 851 protruded from the platepart 80 toward the other side “X2” in the first direction “X” isextended along the through hole 805 in the second direction “Y” in theplate part 80 at a position adjacent to the through hole 805 on one side“Y1” in the second direction “Y” and on the other side “Z2” in the thirddirection “Z”. Further, a second engaging protruded part 852 protrudedfrom the plate part 80 toward the other side “X2” in the first direction“X” is extended along the through hole 805 in the third direction “Z” inthe plate part 80 at a position adjacent to the through hole 805 on theother side “Z2” in the third direction “Z” and on one side “Y1” in thesecond direction “Y”.

Therefore, when the first member 8 is fitted to the side face of themotor main body 40, as schematically shown in FIG. 5(a), the firstengaging protruded part 841 is abutted with the end part 223 of theterminal block 22 from one side “Z1” in the third direction “Z”, and thesecond engaging protruded part 842 is abutted with the end part 224 ofthe terminal block 22 from the other side “Y2” in the second direction“Y”. Further, when the first member 8 is fitted to the side face of themotor main body 40, as schematically shown in FIG. 5(b), the firstengaging protruded part 851 is abutted with the end part 225 of theterminal block 22 from the other side “Z2” in the third direction “Z”,and the second engaging protruded part 852 is abutted with the end part226 of the terminal block 22 from one side “Y1” in the second direction“Y”. Therefore, the first member 8 is fixed to the motor main body 40from both sides in the second direction “Y” and from both sides in thethird direction “Z”.

(Structure of Engaging Plate Part 75)

In the terminal cover 7 in this embodiment, a portion of the terminalcover 7 which is overlapped with the side face of the motor main body 40is formed to be a cover part 71 which covers the terminal part 25, andthe first member 8 of the terminal cover 7 is provided with an engagingplate part 75 which is extended from the cover part 71 and is overlappedwith the end face 12 on the opposite-to-output side “L2” of the motormain body 40. The engaging plate part 75 is formed with an engagingrecessed part 750 which is opened toward the output side “L1”, and theengaging recessed part 750 is fitted with the protruded part 17 which isprotruded from the end face 12 on the opposite-to-output side “L2” ofthe motor main body 40.

In this embodiment, the engaging recessed part 750 is formed in a grooveshape which is extended along the engaging plate part 75 and a width ofthe engaging recessed part 750 is narrowed toward a tip end side from aside (root side) of the cover part 71. A width on the tip end side ofthe engaging recessed part 750 is equal to an outer diameter of theprotruded part 17, and the protruded part 17 is fitted to and engagedwith the tip end part of the engaging recessed part 750.

A center portion 751 in a width direction of the engaging recessed part750 is formed to be deeper than an adjacent portion 752 which isadjacent to the center portion 751 on both sides. Therefore, theprotruded part 17 is abutted with the adjacent portion 752 and is notcontacted with the center portion 751. Therefore, even when an end parton the opposite-to-output side “L2” of the rotation shaft 50 is exposedfrom the bearing 61 structuring the protruded part 17, the rotationshaft 50 does not contact with the engaging recessed part 750.Accordingly, rotation of the rotation shaft 50 is not disturbed.

(Structure of Circuit Board Support Face 801 Side of First Member 8)

A face on one side “X1” in the first direction “X” of the plate part 80of the first member 8 is formed to be a circuit board support face 801which supports the wiring board 27 from the other side “X2” in the firstdirection. The wiring board 27 is formed with holes 278 through whichthe terminals 24 passing through the through hole 805 are penetrated,and a face of the wiring board 27 on one side “X1” in the firstdirection “X” is formed with wiring patterns 279 around the holes 278and the like. The face of the wiring board 27 on one side “X1” in thefirst direction “X” is mounted with the connector 28 at a positionseparated on one side “Z1” in the third direction “Z” with respect tothe holes 278 and the like. The connector 28 is arranged so that aconnecting part 280 where connector terminals (not shown) are disposedare directed to one side “Z1” in the third direction “Z”.

The first member 8 is provided with circuit board holding pawls 81 atend parts on both sides in the second direction “Y” of the circuit boardsupport face 801 so as to be protruded to one side “X1” in the firstdirection “X” and abutted with a face of the wiring board 27 on one side“X1” in the first direction “X”. Therefore, the wiring board 27 can beheld by the circuit board support face 801 and the circuit board holdingpawls 81 in a thickness direction of the wiring board 27 (“X”direction). In this embodiment, recessed parts 271 are formed inportions overlapping with the circuit board holding pawls 81 at endparts of the wiring board 27 on both sides in the second direction “Y”,and the circuit board holding pawls 81 are fitted to the recessed parts271. Therefore, end parts of the wiring board 27 are held by the circuitboard holding pawls 81 in an extending direction (“Z” direction) of theend parts where the recessed parts 271 are formed. Further, the circuitboard holding pawls 81 are formed on both sides of one side “Y1” and theother side “Y2” in the “Y” direction. Therefore, the wiring board 27 isheld by the two circuit board holding pawls 81 from both sides in thefirst direction “X”, from both sides in the second direction “Y”, andfrom both sides in the third direction “Z” in an overlapped state withthe circuit board support face 801. Further, the first member 8 isprovided with a positioning protruded part 802 which is protruded to oneside “X1” in the first direction “X” from an end part on the other side“Z2” in the third direction “Z” of the circuit board support face 801 soas to extend in the second direction “Y”. The positioning protruded part802 is abutted with an end part on one side “X1” in the first direction“X” of the wiring board 27 to position the wiring board 27. Therefore,the first member 8 is capable of holding the wiring board 27 which isplaced and disposed on the circuit board support face 801 at apredetermined position. Further, when insertion of the connector 28 isto be performed, a force applied to the wiring board 27 to the otherside “Z2” in the third direction “Z” can be received by the positioningprotruded part 802 and thus positional displacement and the like of thewiring board 27 can be suppressed.

(Structure of Second Member 9)

Next, a structure of the second member 9 will be described below. In thefollowing descriptions, a state is described that the second member 9 isturned to one side “R1” around the axial line “Y0” through the hingepart 70 to cover the first member 8 from one side “X1” in the firstdirection “X”. Therefore, regarding the first direction “X” and thethird direction “Z”, the directions of one side and the other side shownin FIG. 6(a) and FIG. 7(b) are reversed. Accordingly, when a structureof the second member 9 is described, in FIG. 6(a) and FIG. 7(a), thedirections of one sides “X1” and “Z1” and the other sides “X2” and “Z2”are indicated by the parenthesis.

As shown in FIGS. 6(a) and 6(b) and FIGS. 7(a) and 7(b), the secondmember 9 is provided with a plate part 90 which covers the wiring board27 when the second member 9 is fitted to the first member 8. The platepart 90 is formed with a cut-out part 98 for exposing the connector 28.

An end part on the other side “Z2” in the third direction “Z” of theplate part 90 is provided with a protruded part 902 which is protrudedtoward the other side “X2” in the first direction “X” so as to extend inthe second direction. The end part where the protruded part 902 isformed and an end part on the other side “Z2” in the third direction “Z”of the first member 8 is connected with each other through the hingepart 70.

The second member 9 is formed with side plate parts 93 protruded towardthe other side “X2” in the first direction “X” on both sides in the “Y”direction of the plate part 90. The side plate parts 93 are overlappedwith the second side plate parts 83 of the first member 8 from outersides.

The plate part 90 is formed with first circuit board holding parts 96protruded to the other side “X2” in the first direction “X” at twopositions in the second direction “Y” in an end part on the other side“Z2” in the third direction “Z”. Further, the plate part 90 is formedwith a second circuit board holding part 97 protruded to the other side“X2” in the first direction “X” in an end part on one side “Z1” in thethird direction “Z”. Therefore, when the second member 9 is fitted tothe first member 8, the first circuit board holding parts 96 and thesecond circuit board holding part 97 press the wiring board 27 on thecircuit board support face 801 of the first member 8. Accordingly,floating of the wiring board 27 from the circuit board support face 801can be suppressed.

(Structure of Engaging Part of Second Member 9)

End parts on the other side “Z2” in the third direction “Z” of a pair ofthe side plate parts 93 of the second member 9 are formed with engagingpawls 901 protruded to the other side “Z2” in the third direction “Z”.The engaging pawl 901 structures the first engaging part 91 togetherwith an end part on other side “Z2” in the third direction “Z” of theside plate part 93.

Further, end parts on one side “Z1” in the third direction “Z” of a pairof the side plate parts 93 are formed with second engaging parts 92 in apawl shape which are protruded to the other side “X2” in the firstdirection “X”. A tip end part of the second engaging part 92 is bent toone side “Z1” in the third direction “Z”. In this embodiment, the sideplate part 93 is formed with a slit 920 along an edge of the secondengaging part 92. Therefore, the second engaging part 92 is capable ofbeing elastically deformed in the third direction “Z”.

The first engaging part 91 and the second engaging part 92 are separatedfrom each other in the third direction “Z”, and the first engaging part91 is located at a position closer to the hinge part 70 than the secondengaging part 92. Therefore, when the second member 9 is turned to oneside “R1” around the axial line “Y0” to be fitted to the first member 8,the first engaging part 91 is abutted with the first engaging protrudedpart 88 of the first member 8 from the other side “X2” in the firstdirection “X” and from one side “Z1” in the third direction “Z”.Further, the second engaging part 92 is abutted with the second engagingprotruded part 89 of the first member 8 from the other side “X2” in thefirst direction “X” and from the other side “Z2” in the third direction“Z” at a position separated from the first engaging part 91 on one side“Z1” in the third direction “Z”. In this case, the second engaging part92 is elastically deformed to the other side “Z2” in the third direction“Z” so as to narrow the slit 920 and then the second engaging part 92 isengaged with the second engaging protruded part 89. Therefore, thesecond engaging part 92 is elastically abutted with the second engagingprotruded part 89 of the first member 8 from the other side “Z2” in thethird direction “Z”.

According to this engagement mechanism, the second member 9 is preventedfrom disengaging from the first member 8 in a direction separated fromthe first member 8 by the first engaging part 91 and the second engagingpart 92. Further, the first engaging part 91 and the second engagingpart 92 are engaged with the first member 8 in reverse directions in thethird direction “Z” and thus the first engaging part 91 and the secondengaging part 92 are hard to be disengaged from the first engagingprotruded part 88 and the second engaging protruded part 89. Further,when the second member 9 is turned with the hinge part 70 as a center,the first engaging part 91 is engaged passing through a positionseparated from the hinge part 70 with respect to the first engagingprotruded part 88, and the second engaging part 92 is engaged passingthrough a side of the hinge part 70 with respect to the second engagingprotruded part 89. Therefore, the first engaging part 91 and the firstengaging protruded part 88 are surely engaged with each other and thesecond engaging part 92 are surely engaged with the second engagingprotruded part 89.

Principal Effects in this Embodiment

As described above, in the terminal cover 7 fixed to the motor main body40 of the motor 10 in this embodiment, the engaging plate part 75 isextended from the cover part 71, which covers the terminal part 25 onthe side face of the motor main body 40, to a position overlapped withthe end face 12 on the opposite-to-output side “L2” of the motor mainbody 40, and the engaging plate part 75 is provided with the engagingrecessed part 750 to which the protruded part 17 of the end face 12 onthe opposite-to-output side “L2” of the motor main body 40 is fitted.Therefore, even when an external force is applied to the terminal cover7, positional displacement of the terminal cover 7 is hard to beoccurred. Therefore, a trouble is hard to occur in an electricallyconnected portion of the terminals 24 with the wiring boards 27 in aninside of the terminal cover 7. Further, the protruded part 17 isstructured of the bearing 61 and thus a dedicated design for providingthe protruded part 17 in the motor main body 40 is not required.Further, the bearing 61 serves as a reference of the motor 10 and thusits positional accuracy is high. Therefore, engagement of the engagingplate part 75 can be performed surely. Further, it is structured thatthe bearing 61 is covered by the engaging plate part 75 and thus therotation shaft 50 is suppressed from being contacted with the outside.Therefore, malfunction due to an external force can be avoided. Further,dust or a foreign matter can be prevented from being entered into thebearing 61. In addition, even when oil is impregnated into the bearing61, the oil can be suppressed from being leaked out.

Further, the engaging recessed part 750 is formed in a groove shape andthus the protruded part 17 can be easily fitted to the engaging recessedpart 750. Further, the protruded part 17 is fitted to a tip end part inan extending direction of the engaging recessed part 750 which is formedin a groove shape and thus positional displacement of the terminal cover7 in a direction separated from the motor main body 40 is suppressed byengagement of the protruded part 17 with the engaging recessed part 750.

Further, the terminal cover 7 and the motor main body 40 are fixed toeach other by the engaging parts 86 and 87 and the like and thus, theterminal cover 7 can be attached to the motor main body 40 and, inaddition, the terminal cover 7 and the motor main body 40 can be fixedsurely. Therefore, even in a case that a large force is applied to theterminal cover 7 through the connector 28 when insertion or separationis performed in the connector 28, positional displacement of theterminal cover 7 can be prevented. Accordingly, a trouble is hard tooccur in an electrically connected portion of the terminals 24 with thewiring board 27 and the like.

Further, in this embodiment, the terminal cover 7 is a resin moldedproduct which is integrally provided with the first member 8 fixed tothe motor main body 40, the second member 9 which covers the firstmember 8, and the hinge part 70. Therefore, after the first member 8 isfixed to the motor main body 40, when the second member 9 is turnedthrough the hinge part 70 so that the first member 8 is covered with thesecond member 9, the first member 8 and the second member 9 are engagedwith each other. Accordingly, in comparison with a case that the firstmember 8 and the second member 9 are separately structured from eachother, the number of components can be reduced and work for attachingthe second member 9 to the first member 8 can be performed efficiently.As a result, a structure that the terminal part 25 of the motor mainbody 40 is covered by the terminal cover 7 is structured at a low cost.

Other Embodiments

In the embodiment described above, the protruded part 17 is formed byusing the bearing 61. However, the protruded part 17 may be formed inthe end plate 65 or the like. Further, in the embodiment describedabove, the engaging recessed part 750 is formed in a groove shape.However, the engaging recessed part 750 may be a hole having the sameshape as the protruded part 17.

INDUSTRIAL APPLICABILITY

In the present invention, in the terminal cover fixed to the motor mainbody, the engaging plate part is extended from the cover part, whichcovers the terminal part on the side face of the motor main body, to aposition overlapped with the end face on the opposite-to-output side ofthe motor main body, and the engaging plate part is provided with theengaging recessed part to which the protruded part of the end face onthe opposite-to-output side of the motor main body is fitted. Therefore,even when an external force is applied to the terminal cover, positionaldisplacement of the terminal cover is hard to be occurred.

1. A motor comprising: a motor main body comprising a rotation shaftwhich is protruded toward an output side; and a terminal cover which isfixed to the motor main body; wherein the motor main body comprises: aterminal part which holds terminals in a side face of the motor mainbody; and a protruded part which is protruded from an end face on anopposite-to-output side of the motor main body toward theopposite-to-output side; wherein the terminal cover comprises: a coverpart which covers the terminal part on the side face of the motor mainbody; and an engaging plate part which is extended from the cover partso as to overlap with the end face; and wherein the engaging plate partcomprises an engaging recessed part to which the protruded part isfitted.
 2. The motor according to claim 1, wherein the protruded part islocated on a rotation center axial line of the rotation shaft.
 3. Themotor according to claim 2, wherein the protruded part is formed by abearing which supports the rotation shaft on the opposite-to-outputside.
 4. The motor according to claim 3, wherein a depth on a centerside of the engaging recessed part is deeper than a depth of an adjacentportion to the center side, and the protruded part is contacted with theadjacent portion.
 5. The motor according to claim 4, wherein theengaging recessed part is a recessed part in a groove shape which isextended in a radial direction, and the protruded part is fitted into atip end part in an extending direction of the engaging recessed part. 6.The motor according to claim 5, wherein the terminal part comprises aterminal block which is protruded to an outer side in a radialdirection, and the cover part comprises an engaging part which isengaged with the terminal block.
 7. The motor according to claim 6,wherein the terminal block comprises a recessed part which is openedtoward one side in a rotation center axial line direction of therotation shaft on an inner side in the radial direction, the recessedpart being provided in a part of the terminal block in a circumferentialdirection of the motor main body, and the engaging part comprises: anarm part which is overlapped with an end part on one side in therotation center axial line direction of the terminal block, and a pawlpart which is bent toward the other side in the rotation center axialline direction at a tip end part of the arm part so as to enter to therecessed part.
 8. The motor according to claim 6, wherein the engagingpart comprises: a first engaging protruded part which is abutted with anend part of the terminal block facing a rotation center axial linedirection of the rotation shaft; and a second engaging protruded partwhich is abutted with an end part of the terminal block facing acircumferential direction.
 9. The motor according to claim 1, whereinthe cover part comprises an abutting part which is abutted with the sideface of the motor main body.
 10. The motor according to claim 1, whereinthe terminal cover holds a wiring board which supports a connectorelectrically connected with the terminals.
 11. The motor according toclaim 1, wherein the terminal part comprises a terminal block which isprotruded to an outer side in a radial direction, and the cover partcomprises an engaging part which is engaged with the terminal block. 12.The motor according to claim 11, wherein the terminal block comprises arecessed part which is opened toward one side in a rotation center axialline direction of the rotation shaft on an inner side in the radialdirection, the recessed part being provided in a part of the terminalblock in a circumferential direction of the motor main body, and theengaging part comprises: an arm part which is overlapped with an endpart on one side in the rotation center axial line direction of theterminal block, and a pawl part which is bent toward the other side inthe rotation center axial line direction at a tip end part of the armpart so as to enter to the recessed part.
 13. The motor according toclaim 11, wherein the engaging part comprises: a first engagingprotruded part which is abutted with an end part of the terminal blockfacing a rotation center axial line direction of the rotation shaft; anda second engaging protruded part which is abutted with an end part ofthe terminal block facing a circumferential direction.
 14. The motoraccording to claim 3, wherein the terminal part comprises a terminalblock which is protruded to an outer side in a radial direction, and thecover part comprises an engaging part which is engaged with the terminalblock.
 15. The motor according to claim 14, wherein the terminal blockcomprises a recessed part which is opened toward one side in a rotationcenter axial line direction of the rotation shaft on an inner side inthe radial direction, the recessed part being provided in a part of theterminal block in a circumferential direction of the motor main body,and the engaging part comprises: an arm part which is overlapped with anend part on one side in the rotation center axial line direction of theterminal block, and a pawl part which is bent toward the other side inthe rotation center axial line direction at a tip end part of the armpart so as to enter to the recessed part.
 16. The motor according toclaim 14, wherein the engaging part comprises: a first engagingprotruded part which is abutted with an end part of the terminal blockfacing a rotation center axial line direction of the rotation shaft; anda second engaging protruded part which is abutted with an end part ofthe terminal block facing a circumferential direction.